It's up to you.
The fins look fine, but now you're facing the same problem I am: how to make sure that the flow is going to be both fast, and reach the baseplate, at the cross.
In my case, I'll be trying a plastic flow seperator, something like a cross shaped blade.
Come to think of it, I don't remember seeing anyone try a jet inpingement in a block (except for direct-die cooling), except maybe for BillA, but I don't think he posted anything about it here.
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