Pic was the Maggie's HQ tree set-up in the parlor last year. Yes, there is an outlet in the floor. This year, we're in process of going back to colored lights for the darn pagan tree.
Tree is a fire hazard, but the fake ones just feel fake and seem to create the unpleasant feeling of bank-lobby to me. I don't like to keep a real dead tree up for over 14 days but maybe I'm a scaredy cat.
I like the tree in the middle of the room, away from heat and far from a fireplace. I keep the water full, and I use this tree water recipe. Same trick that makes cut flowers last longer. Best to use warm water to soften any sap that would block water uptake. Cut trees are thirsty.
I use a heavy and heavy-duty welded steel stand like the one below. It holds a gallon of water and could easily hold a 12' tree.
After 14 days or so, I carry the tree with its stand and lights out to the front of the house to abide a while, or even months, with an extension cord to keep it lit. I don't even try to keep last years' lights anymore.
Good news: Mrs. BD is already practicing her carols on the pianny. It's a delight for Bird Dog, even the missed notes.