I'm living in an African country where power supply is not stable and there are frequent shutdowns. My home network is setup with one Archer Mr200 working onto the 4G network, with two range extenders to cover all points of my house. Fluctuations forced the installation of surge protectors (more times I found both extenders reset to factory status due to electricity instability) but I cannot find a good solution for the power shutdowns. The solution itself is very simple: UPS, that already is powering my router. 

The beauty of the range extenders is that you plug them into a wall socket and that's all! If I have to put a ups on the floor it is not nice to see and dangerous for your feet in the night. There are wall mounted solutions but if I have to spend 5-10 times the value of an extender it is better to find other solutions. 

What I would like to find is a very small UPS, to plug in a socket and plug the extender directly onto it; something like the powerline PG2400 Passthrough, if technically possible. It is required very limited backup capacity, 15 minutes maximum (for longer times other solution can be adopted), and it would be even very useful for protecting the devices in place of the surge protectors. Please consider that not all of your clients live in countries where power issues are not existing, I do believe that there would be a good market for something like this. If it already exist, I couldn't find it.