7.1 speaker placement question

[SPIDERone]

Hey everyone,

I have 7.1 speakers and am getting a new 7.1 surround system tomorrow - My 'decent' sized/powered speakers are a center channel, 2 fronts (L/R) and 2 surround (L/R). I also have some smaller sized speakers (bookshelf sized?) and wasn't sure where they would fit in. Would those be better as the "surround back" speakers or the "surround" speakers? I do plan to get replacements at some point.

I'm trying to keep it in a way that the typical surround/louder parts are going to my better (and larger) speakers, and the parts that wouldn't come up as often would be going to the smaller bookshelf-sized speakers.

Here's a back of the receiver.

I've got everything planned out except for these.. do the small ones go to "Surround" or "Surround Back"?