I actually quite liked the idea of the flat rock. It got my wheels turning on what a wall of zoas or something would look like.
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. For now, I also removed the 2 small rocks in the front, but they are coming back.

What are you going to "bolt" the bits to the rock with?Thanks heaps! Those bits will be bolted to the base of the rocks. I am uncomfortable with 'dropping' rocks straight on the glass, and would pref to avoid a full-size sheet or crate. There is 25cm (10") of clearance for SPS. Yeap, I am worried about flow. These are 3 separate rocks in the front, plus that tall and flat 'afterthought' in the back. The scape can be reorganized if needed.
I will be aiming for smaller fish including gobies (including YWG+shrimp) and blennies.
With 8mm delrin rods. I will dril holes through the rock and the plate. They will be drilled at an angle, looking 'inwards'. Like shown below. Once the rods are inserted they will (should) lock each other. There will be 3 or 4 of them for each plate.What are you going to "bolt" the bits to the rock with?