Point Machine Location

[mpr7]

Hi

Should a point machine be placed only on a particular side of the Point?
My understanding is that it should be placed adjacent to the closed switch rail which caters to movement on the reverse direction. I don't remember where I read this or if I had discussed this with someone.
Is there any standard which specifies the need to place a point machine on a particular side?


P.S. please advise me if such general doubts should be posted elsewhere.

Thanks