Ok, so from this set of pics, it looks like you have a chase running overhead from the air handler, over your kitchen cabinets, out to where you ran the lineset for the dx water heater. My big question is: did they put your breaker panel on the other side of the window, or in the air handler closet wall? I've seen it both ways. Either way, there's lots of stuff running through that chase already. No need to further stuff that area with anything.
The big dog outdoor units like in your pic tend to favor lots of parallel cap tubes or a big txv and distributor for metering. Make sure and look before you buy.
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