@Inna22
Henry is in charge of that kind of stuff for our home/listing. For our modem/wifi router, we have it plugged in where it is really difficult to reach and unplug.
Also, I have more than enough power strips, available sockets and usb ports that guests can use to plug/charge their own electronics in the guest room as well as common spaces so guests would never feel the need to "unplug" anything to start with.
Personally for us, it was always really annoying when there aren't enough sockets to re-charge several items at once so Henry and I are in the habit of travelling with our own power strip! Off the top of my head, we both have 1 cell phone each, Henry's tablet, my Kindle, portable charger, bluetooth speaker and/or headphones (earphones), (depending on country and no. of people in our group) portable wifi hotspot and when going to hotter climates our handheld electric fans - all these things need to be recharged regularly.
So based on my experience, I would like to suggest that instead of telling people not to unplug something, just provide a few extra power strips that are already plugged into a wall socket so that guests don't have to unplug something in order to charge their phone.