All TP-LINK powerline adatpers for sale are comaptible with each other. :) Maybe that's why there is no compatibility list.

When connection drops, how about status of all lights on both units in the kit? Did you turn off power-saving mode using the beta tool?...

Yes! TL-WPA281KIT and TL-WPA4220 are compatible with each other but the rate will be limited by PA2010 in the kit.

No such a feature to daily reboot the router.

MR3420 has bandwidth control feature. Using Bandwidth Control, we can assign a specific minimum or maximum bandwidth for each computer, which means they have less interference on each other. Is that...

Parental control can allow some clients access to some websites. Not sure if it is what you need. The emulator: http://www.tp-link.com/resources/simulator/TL-MR3420/index.htm The guide:...