Newbie questions on LCR speakers

Over the last year I've been getting more into my home theater (aka living room) set up. I know I need to upgrade my LCR speakers and do a better job with locating them. Due to a non-ideal room setup I currently have my LCR speakers in the ceiling with angled monoprice speakers (roast me all you want), driven by a Denon x1700 and I recently got two SVS PB-1000s https://omegle.onl/ vshare .
My questions: (1) Is there a significant difference between bookshelf or...

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