Right now I have my 100" mounted on lighting (professional) tripods. A little squigly & moves a bit each time...so my AWOL laser has to be tweeked wayyyy too often. Eventually moving up to ceiling mounted motorized. Behind that I plan on having high quality room darkening pull down shade ( hell maybe have that motored too). with the LEDs attached to the shade. Both will be a few inches from the wall...so on your thought 60/m should be plenty? At 88" X 48" it'd be 120 LEDs x 65-70 LEDs. Total LED layout - 380 LEDs square. Gonna use BTF WS2815.