Frankly, 4-5 would be all you’d need—everyone isn’t going to need a charge all the time. And TBH, since it is a home game, no problem charging on a side table. It’s not like someone is going to walk off with your phone.
1.) my poker room is a three season room that has only two wall outlets, so actually, table chargers would be handy.
2.) I agree that not everyone will need to charge at the same time, but are you not aware of the PCF motto? "If its worth doing, its worth overdoing." Wait, or is it, "Nothing but the best for my players."
But in seriousness, that's why I was thinking 5 doubles instead of 10 singles. That gives everyone an outlet at their seat, and I can't imagine a double is much more than a single in terms of cost...