Hard to plan an aquascape around anemones seeing as they have a penchant to go wherever they please.
If it's a smaller tank and you want to be able to keep other inverts, I'd stick with the bubble tips. If you can find a healthy sebae anemone somewhere that might work as they tend to settle down and not move, but very few of them survive the transition to captive life and they don't reproduce as readily as bubble-tips so they're not necessarily the best choice. I'm also not certain whether two different species of anemone will tolerate each other in a 40 gallon tank, they might go to chemical war with one another if not outright try to kill each other.
Otherwise, elegance corals, frog spawns, hammer corals, pulsing xenia... they all have incredible movement.
In any case it sounds like the tank is established already, so if I were doing this I'd sort out the anemones first, let them go in, choose their spot, wait until they haven't moved in a good long while, then start buying corals to place around them.
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