Unfortunately there is no way to tell, as there are many factors that can hinder or help
Some of the rain users are indside the coverage areas, and get less speed than me.
I am in a similar situation, just outside coverage and get 40+mb/s
Best would be to get a buddy or someone at work to loan you theirs to test. Or bite the bullet and order. Most ISP's have a return policy, but just check first.
PS: ISP's are currently short stocked of the devices, so you might have to wait a bit