double sided tape, i would stay away from glue as some can give off gases/fumes when get hot, also dont put it to close to the heat bulb as over time the back ground will start to flake off, (thats if you puttin it on the inside)
cool. all get double sided tape this week. Am puting it in the inside of viv as ave got a wood viv. Would a just take it along so much until heat buld? just leave a space
ive had a few and all of them over time started to flake off, so i would just keep an eye on it, i had my along the back and from top to bottom, see how you get on. most of those back grounds where made to go on the outside, like for fish tanks etc, glass tanks. ....
but see how you get on, and keep me posted because i would love to find one than doesnt flake over time lol add a bit of colour for diesel.