For DC Renard, you would probably be looking for https://www.doityourselfchristmas.com/wiki/index.php?title=Renard_64XC or https://www.doityourselfchristmas.com/wiki/index.php?title=REN_32_Controller_Board as the controller and then you would have to use a DC ssr to connect your display items to. Here's the wiki page for that: https://www.doityourselfchristmas.com/wiki/index.php?title=DCSSRMy problem is that when I search for one, none come up. It looks like the website Renard Plus has a few things, but I'm not seing one for 12v DC.
The beauty of this type of setup (not all on one board) is that you could have 12v DC SSRs, 5v DC SSRs, AC SSRs etc. You can also mix and match (within limitations) to what you need.
Note that all of these solutions would probably require you to upload the gerber file to a pc fab house and order them. Sounds like its a pain but its really not too bad, just something to know.
It probably sounds like I'm pushing you in this direct but I'm really not trying to. I just think its good to know all the information you can before making the decision. I think its pretty cool that in this one thread multiple options have been presented. Each with their own merits.