I think you may need this one
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1534952584&searchtext=Floor+mod
You need open it in the settings backend ~ ; ) And Thank you for your liking!!!

What do you mean by 'settings backend'? Apologies, I'm not completely familiar with the modding of this game. :>

Sorry, it may be the terrible and hateful Google Translate at work. You need to subscribe to mods and open the game. Open mods in the start menu, find the floodmod in the second row of the first row, check it, and then you can build more floors of buildings in the game

Some mods that require changes to the underlying logic and gameplay of the game need to be done in this way （。＾▽＾）

Hopes it useful for you!

Also when you are in the game, you can go to Settings > Mods > FloorMod. Then change how many floors you want