So here is a thing you need to be aware of: Picatinny Vs. Weaver style.
The slots are different dimensions. For many applications it won't matter, but have seen people try and use Pic rails with Weaver rings, then cuss the mfg because of a DFO issue.
Unless you have a tin-can for a scope, that has no amount of adjustment, you won't "Need" to have a base with any can't to achieve that distance.
A Scope with little internal adjustment, AND burning up a bunch of it just to get zeroed can get you to the point of needing something.
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