Aligning Linear Rail to Datum

I've seen that most guide manufacturers have mounting guidance that includes using push plates, push screws, needle rollers or taper gib(s) to retain/align a rail against a reference edge, however there seems to be no recommendation for proper spacing of such, other than periodic, or full length. I would imagine that it also differs based on rail size as well.

I'm wondering if there is a recommendation, or a general rule of thumb regarding this?

https://www.cnczone.com/forums/attac...d=470850&stc=1

https://www.cnczone.com/forums/attac...d=470852&stc=1

https://www.cnczone.com/forums/attac...d=470854&stc=1