Placing the M80's that high will be a significant compormise. unless you places your chairs on 24 inch stands as well. Of couse it will work but you certainly wont be taking advantage of what the speakers can offer with proper placement.

Perhaps you need to look into getting stand type component racks. Such as salamander Archetype series also known in the DIY community as "flexy racks" and keep the RPTV on the floor. Or get a LCD/Plasma and wall mount it.