The number of channels viewed simultaneously (sessions) is a multiple of two, i.e. you can choose in your personal account only an even "Number of allowed devices" - 4, 6, 8, 10, etc. (you cannot choose 3, 5 or 9). By default, simultaneous viewing of two channels is allowed (on one or two devices).
The cost calculation formula is as follows - number of allowed devices / 2 * basic package cost (the basic package cost is the default cost of the package (i.e., for 2 channels)).
The IP address does not matter, one viewing device can be located in your city, and the second on the other side of the globe, but in this case, there will certainly be difficulties with choosing the optimal server for different locations.
A tip from support:
If you have already bought a package (subscription) and then decided to increase the number of allowed devices, the system will not allow you to do this. To change the "Number of allowed devices" you need to stop the package through the service administration (by sending a message in chat or in support) or wait for it to end. After the package is stopped for you, change the number of sessions in the settings of your personal account, save it and buy the package again. The cost of a package with a large number of devices will be more expensive, for example, the cost of a package for 4 sessions is twice as expensive as for 2 sessions (for 6 it is three times, for 8 it is four times more, etc.). Or, without stopping the package, add a sub-user and buy a package for him. From the sub-user's playlist, you can simultaneously watch another 2 channels on your other devices. The cost is the same, but the second option (with the addition of a sub-user) is more convenient - different packages can be connected, for example, a package for a children's TV and packages for your TVs (may contain adult channels). Or a package with the addition of the optional "Sport" package and a package without it.
The number of devices (or channels) allowed for simultaneous viewing can be seen in your personal account in the Home section.

in the Packages section

You can select another number of devices in the Settings (1) section

you need to do this before buying the package.
There is no need to click any button to save changes, new field values are saved automatically. The appearance of an information window in the upper-right corner indicates the saving of changes.
If you need to watch, for example, five channels (sessions) at the same time, then in the settings of your personal account you select 6 allowed devices, save and buy the package. You can simultaneously watch up to 6 channels.
WARNING! The web player is also a viewing device and if you are watching at home, someone from the family is watching at the cottage, and you are also launching the web view, then this will already be three channels watched simultaneously and you will get a viewing ban for 10 minutes, an information video will start playing. Information about this can be found in the "Journal-Log of work" section of your personal account, and in the "Journal-Log of viewing" section you can see the sessions (channels) with which you had a violation.
After 10 minutes, the viewing will resume, but if you do not correct the violation (do not remove the viewing of the extra channel(s)), then after a few minutes you will get a repeated ban and this will continue until the violation is eliminated.
WARNING! On many devices, if you do not turn off the player and at the same time turn off the device button on the remote control in standby mode, the player remains working, and if you then start watching two more channels thinking that the viewing on this device is turned off, you will get a ban.
Many devices also have a property to turn on in working mode when the power goes off and on, so do not forget to completely de-energize such devices when leaving home or from the cottage for a long time.
