I had a new window in a few weeks ago alongside my computer desk - I asked the fitters if they could wait till I left the room to move the desk , I sloped off and cried quietly till all was back in situ.
I hid mine by chipping away about 50mm of plaster/brick, about 5 inch wide. I then put a piece of plasterboard over the hole and re plastered over the board.
I can now put new cables through any time I wish.
mine were a right mess so i invested 99p on a packet of 25 velcro ties from home bargains last week, they're still not hidden but they're all neatly coiled and taped behind the tv unit.