Another option to look into is a vertical slot processor.
They're not cheap, but my Nova 16x20 vertical slot processor has
three slots yet takes up less square inches in the sink than a
single 16x20 tray. Another benefit is that having a very tiny
surface area, your chemistry evaporates much more slowly and
oxidizes more slowly, allowing you to stretch a batch for a very
long time - especially if you use long-lasting chemistry like
Ansco 130 as a print developer. I once had a batch last me
literally months and dozens of 8x10 and larger prints (including
maybe close to a dozen 16x20s) before I had to dump and replace
it.