Nice layout and siting; no trees, full sun all day. Should be sweet.
When thinking about the best way to protect the beds, I imagined that you were going to raise and bloom the seedlings in place. Plus, you said the "D" word. That's why I like having at least 4 feet of height, so you can have room for scapes. It's one thing to have deer nibble the buds from a named cultivar, but a seedling that's never been seen before, why, that would be unthinkable.
Grouped together as the beds are, deer fence might be a better solution in the long run. I've seen 4 x 8 cattle fence panels on farm and livestock supply sites which could be used as a barrier. I think I've seen a garden tip here with instructions.
It's a little extreme, but an electric fencer would be something to think about too. The smaller units aren't that expensive, and you can do it with maybe 4 wires. If you tie colorful pieces of ribbon to the lower wires, domestic animals will only be 'bitten' once.
