Combination grape arbor/blackberry trellis

I ordered a Prime Ark Freedom and a Triple Crown blackberry and have also been contemplating getting a couple of grape vines. I have a spot in my yard that I planned to put the blackberries by building a simple pair of t-posts and string some wire between them. But wondering if I could kill 2 birds with one stone by building a 4 post grape arbor out of 4x4 posts and planting a grapevine at 2 corners and planting the blackberries under wire strung between the other 2 posts. Would these two play well together? What are my main considerations in regard to sunlight and how to orient the grapes versus the blackberries? Or is this idea a bust. I haven’t done enough research on grapes to even have decided on varieties. But the blackberries are a done deal.

I constructed a “vineyard” trellis at the rear of my property. It’s 80’ long and 8’ above the rear ground level so I can walk under it. I designed it to support 5 vines, 16’ on center: 3 table grapes, a blackberry, and a fruiting schisandra vine. My yard is ahead and to the right, my neighbor’s yard is “behind” the black metal fence.

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The triple crowns would benefit from being partially shaded by grapes; may reduce UV damage. North-South row axis generally recommended for blackberries, else one side of row sunbakes and other side is shaded.

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