How to mount PCB to custom arcade case?

I am going to dual mod my custom arcade case and was wondering how others are mounting the PCBs.

I will have **Toodles Cthulhu Multi-Console PCB, Xbox Brawl Pad PCB, Sparky PMD, **FGWidget LED.

I do not want to make any holes to a case, are there any cool item that pros uses to mount PCBs?

Please advise.

Self-adhesive cable tie mounts and cable ties.

This is what they look like.
They can be found in most computer stores and hardware stores.