If you’re using a portable heater make sure that it’s in a safe spot that won’t present a tripping hazard. Tip over protection is always a good idea too. Electrical installations are a little simpler than gas but you still need to be sure to use the appropriate size breaker. ...
I hold up that corner of the mat so that I can see what I’m doing; I want to drill straight down, not at an angle. Even the slightest angle will make the head of the anchor not look flush with the mats (It’s on OCD thing, and a tripping hazard). ...