Plantar Fasciitis Feet Insoles Arch Supports Orthotics Inserts Relieve Flat Feet, High Arch, Foot Pain Mens 4-4 1/2 | Womens 6-6 1/2

I decided to order these because of how much i walk. I wear flats on a daily basis but the inserts are too big. is it a good idea to cut them?

Does this come with one per box?

Is the arch really high on these insoles? I have basically flat feet and some arches are too high for me. Therefore, uncomfortable to walk in.

So if my shoe is 8.5, my insole should also be 8.5? Will it not tighten the fit?thanks