I just finished up fitting two of those onto a camper.
I went lazy with this job, Just series connection, spliced on the roof. Years ago I would have all elaborate with series/parallel switching among other overly complex electrojackassery. While thats loads of fun to build and operate, I soon lose interest. Then just open the door to switch on lights, and plug in my superphone.
Anyway, as far as controller. At Sally Ann, I found NIB Rich Solar 20A MPPT what appears identical to Renogy Rover 20A MPPT, dunno, if its otherwise identical. Its Ok, But were it not a screaming 10$ deal, I would not be happy with it.
Aside from battery type, 12-24V, and load output functions, it needs computer and RS232 connection or bluetooth module to access its customising functions.
Its also a too large for the space available. I had to mount it horizontal.