I didn't have high expectations for this spoiler but I was pleasantly surprised how good it turned out. They paint matched it perfectly and I only used double sided 3M tape.

I know people will ask so here's a link: https://www.ebay.com/itm/274062838070 No affiliation or anything

 

Not sure if I'd trust only the tape, but I've purchased an eBay front bumper for an Accord, it came folded in 3 pieces in a small box and it opened up and increased perfectly overnight. I was very impressed. Paint was on point too

 

Just clicked the link. THAT'S SO CHEAP!! awesome

 

I was skeptical at first but after a lot of highway miles it hasn't budged at all.

 

If it falls off keep driving! I think the factory is just tape also? You are probably right and it's fine.