i have a new rifle coming this weekend that i had built on a mcmillan a3-5 without flushcups. i have since ordered a tab sling with flushcups and ordered a set of female flushcups to install on this rifle. i am wondering where the best place is to install these. i was planning on mounting these on the left side so my bolt isnt digging into my back when walking. if so where should i mount them? also is it better to have the flushcups on the side or bottom when using the sling for shooting? should i order another set of flushcups and install 2 left side and 2 bottom?