Seeing that nobody has responded, I'll take a shot.

First thing: have you tried water hoses with 90° fittings? (If you don't know what I'm referring to, here is a randomly chosen example: https://www.homedepot.com/p/GE-4-ft-Universal-Stainless-Steel-Washer-Hoses-with-90-degree-Elbow-2-Pack-PM14X10008/205473453)

Beyond that, there may be numbers of ways to create hose recesses in the wall behind the washer. What works depends on the wall -- how is it constructed, what is in it (e.g., empty space, plumbing lines, insulation, electrical etc.), what is behind it, and the kind of plumbing you have to deal with (copper? PEX? PVC?).

For example, my laundry room's back wall is drywall on bare 2x4 stud framing with a readily accessible utility closet space behind it. The back side of the wall is unfinished (i.e., without sheetrock on the utility space's side of the wall) The standpipe drain is PVC. The water supply lines are PEX. In this instance, all that made it easy, inexpensive and quick to move the washer's supply and drain connections to the other side of the wall in the utility space and cut access ports through the paneling directly behind the hose connections. This set-up allows my washer to slide all the way back to the wall behind it while still providing ready access to the supply and drain connections.

YMMV.

Thanks!! I got the 90 degree fittings and will see if that works. The back wall is an exterior wall - so not sure what kind of plumbing but have a handyman coming to help with another project and hopefully he’ll have an idea if the fittings don’t do the trick.