Ceiling Support for 8 Speaker"

I'm gonna add four eight-inch definitive technology dia Tower speakers to the ceiling I also bought foam baffles from parts Express this is a 12 inch baffle because these have the ears that swing out to lock it in the ceiling I want to put this over the speaker in the Attic to a keep the insulation out of it and be maybe sound a little better if this doesn't work then I'll box it in with some two by fours and plywood and make an enclosure between the trusses this is an adjustable drywall ceiling tile hole cutter it'll cut you a one point two weeks to 11 point 18 circle it's got the shield to go up against the ceiling when you cut and then it's got the butterfly cutter with all the bits and the tip so we'll see how this works I cut practice holes in drywall and his tool is a fail there's too much spinning mass it's unbalanced to cut a precise hole this would be good at maybe if you're a