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my small home office I bought Genelec active monitors/subwoofer for a 2.1 system, and I'm using the Genelec Kit to calibrate the monitors and subwoofers with the calibration stored in the monitors/subwoofer. My use case is different that yours, obviously, but I've toyed with the idea for using Genelec monitors in my living room
One issue with active monitors is hiss that can be audible quite far away in some cases, and in some reviews the hiss is noted as very objectionable. This may or may not be an issue for you, but I would not like to hear hiss during quiet parts in a movie. In case you're considering the Kali Audio IN-8 monitor, note that it has just been updated to a 2nd version where they claim to have reduced the hiss (self-noise) by 12 dB.
Unlike most subwoofers for home use active monitors does not always have auto-standby, so you'll need another method for turning them on/off unless you leave them on all the time (hissy monitors in a sleeping room is not for me).
Powering the monitors is another issue but pre-made cables like these ones in varying lengths should help with that (with plugs relevant for where you live). Can then use a power strip to turn off/on all the monitors in one fell swoop.
Power Core Cable With female protective contact/XLR to IEC/XLR male connector, For parallel power transmission and balanced audio signal, Length: 5 m, Dual ended split length: 1 m, Colour: Black
www.thomann.de