I would opt for the two inch ram mount, rather than the smaller one. It is more than needed for a H7 but if you ever step up you wont need to upgrade.

Lots of good feedback on the balzout mounts, they have knurled knobs at the joints so they are more solid but very pricey.

If you opt for the ram mount look on amazon, they sell one that matches the gimbal mount dimensions so you dont need to drill the mount.