wanting a smooth firewall, where should i mount clutch master cylinder?

[83c10wit454]

so im about to order a frame mounted brake booster from scotts hotrods, but then i saw their under the dash unit that can mount the booster, also the clutch and brake cylinder. i like the the idea of frame mounted to eliminate clutter under the dash as i will also have vintage air under there to. so i was wondering of a good way to mount my clutch master cylinder if i went and got the frame mounted booster kit. or would it be eaiser to do the under the dash setup?