A: Check out the photo I sent with my review. The mounts are large, look great, and should be able to mount two hose bibs.
A: yes if you are installing those hose bibs after you installing the mounting blocks I would back up the block with some 3/4" plywood to screw the hose bibs into.
A: Thank you for your interest in Builders Edge. The mounting surface on this mounting block is 6" wide x 10" high.
A: 6" x !0"