Is it weird that these look kinda like butlins

These do not grow for me. I made a District Style and added them, but they do not grow in the style or elsewhere.

Ploppable versions show up as parks without RICO mod. I don't know how to change menu locations of buildings, sorry.

Is there a chance to make it on Parks or Police page?

Yes, I do understand now, thank you :-)
I actually made use of the building themes already to let them grow in. Works great (although it can leave empty spaces and not always "connect" buildings very neatly, but I guess to avoid that you have to precisely plop them in manually, which takes more time). But now extra clear that there is no leveling up.

Cheers! Mostly they're for people that don't use RICO and instead use Plop the Growables mod. Without this mod, the buildings will still grow, just randomly, like other houses, commercials etc.

With Building Themes mod you can make a 'theme' that contains only these buildings and assign it to a district, so only the selected buildings 'grow' there. In this case, because the building theme doesn't contain any higher-level buildings, the buildings will never 'level-up', but they can still 'grow' if that makes sense.

I am using your plop version as "quick and cheap" housing near an industry zone, and I think it looks great.

Nice job and thank you for creating and sharing!

One question though: how can these growable buildings actually grow, if they are all level 1? (no higher levels to grow too -- or maybe I don't understand how it works ;-).