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i'd say zipties
metal brackets might work to... if you can get your hands on an old computer case that's a great source of sheet metal... the cover can be cut up with metal sheers and drilled and bended in a vise to make small brackets, and in the back of a computer there's usually some unused card slots backed off with metal bits.... these can also be drilled and bended to form brackets.... i curently have on in use as part of my undertray support, but they can be used for whatever.
another thing is velcro... i've seen super strong velctro patches advertised in a hardwarestore as a means of attaching tools like happers to a wall.... i wouldn't trust it withthe whole support of whatever you want to build but it might keep some loose agles in check... than again, make sure that whatever you glue to the car can come off later...
a tiny hole in a hidden spot of a bumper will decrease the value of the car less than a blob of glue on the paint that wont come off.
i used to be reluctant to drill in my car's bumper but there's plenyt of out of sight places where noone would care to look for a little hole... also you might have a look if it's possible to santwich something between an existing screw....
but perhaps a picture of drawing could help more
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