Question about XGIMI Halo

In principle, yes, but the ventilation slots are on the back. So you have to make sure that the device doesn't lie completely flat or sink into something soft, like a blanket, and then the ventilation no longer works.
The speakers are really good for the size and the battery makes the device super mobile. I have a tripod screwed on and the keystone correction means I can also use it in bed or in the bathroom.
But a wall would be the best place.