A quick search of "Cascadia perch mount" on the "search forums" will quickly fill your desltop, the floor in your room, and likely produce a roll of printer paper out your front door.
The work's already been done -- nearly to death -- and a properly phrased search should answer your frequently-posed question with solutions galore.
I'm not trying to be difficult here, but *lots* of folks have hashed this matter to death, and said search will be *much faster for you" than posting yet another new thread about what amounts to old work.
If you still don't come up with anything helpful, please re-post the question ALONG WITH WHAT "YOU LEARNED FROM THIS SITE and any number of professionals who work in this field will be happy to help you from there.
73