In my %appdata%\7DaysToDie\Mods\ folder, I have 3 folders - yours, Deverezieaux's and the one Teragon generates. I think that's all that is necessary to make use of the prefabs, but it doesn't seem to have added prefabs from these folders.
That's the right approach and should do it. I want to double-check a couple of things.
You list this path:
%appdata%\7DaysToDie\Mods\
But it would normally be:
%appdata%\Roaming\7DaysToDie\Mods
Resulting in:
%appdata%\Roaming\7DaysToDie\Mods\ZZTong-Prefabs
And in that folder at that level you should find a ModInfo.xml file and subdirectories.
Sometimes folks grab a folder out of a ZIP files and later discover there were two layers of ZZTong-Prefabs folders. It depends on how the ZIP gets unpacked as to if that happens.
One possible thing is that I have the Saves and Generated Worlds stored on a different drive (i.e. not in %appdata%). Would that require the Mods folder to be placed there instead of %appdata% maybe?
Yes, perhaps.
One way to tell if the game is seeing your Mods is if you hit F1 while the game is loading. There's a few lines near the top of the log that show the names of the modlets that the game discovered.
It doesn't actually try to interpret/use the modlets until you start a new game, continue a game, or use some of the tools. But at launch as it is getting ready to show you game menus it is discovering things like modlets.
Here's an excerpt from one of my log files. Make note of that first line. You should be able to find similar in your log files. Search on "[MODS]" and it should be near the start of the log file.
My log files are found here:
C:\Users\zzton\AppData\Roaming\7DaysToDie\logs
Code:
2023-01-15T15:25:13 8.852 INF [MODS] Start loading from: 'C:\Users\zzton\AppData\Roaming/7DaysToDie/Mods'
2023-01-15T15:25:13 8.855 INF [MODS] Trying to load from folder: 'Loading-Screen-Jokes'
2023-01-15T15:25:13 8.873 INF [MODS] Loaded Mod: Loading-Screen-Jokes (20.6)
2023-01-15T15:25:13 8.873 INF [MODS] Trying to load from folder: 'Pilles-Super-Brush'
2023-01-15T15:25:13 8.874 INF [MODS] Loaded Mod: Pilles Super Brush (StableA17)
2023-01-15T15:25:13 8.874 INF [MODS] Trying to load from folder: 'RELXIX_UIMENU_MoreRWGSizeOptions'
2023-01-15T15:25:13 8.875 INF [MODS] Loaded Mod: RELXIX_UIMENU_MoreRWGSizeOptions (1.1.1)
2023-01-15T15:25:13 8.875 INF [MODS] Trying to load from folder: 'Teragon POIs'
2023-01-15T15:25:13 8.876 INF [MODS] Loaded Mod: Teragon POIs (A20.6)
2023-01-15T15:25:13 8.876 INF [MODS] Trying to load from folder: 'ZZTong-7D2D-Solo-Game'
2023-01-15T15:25:13 8.876 INF [MODS] Loaded Mod: ZZTong-7D2D-Solo-Game (20.6)
2023-01-15T15:25:13 8.876 INF [MODS] Trying to load from folder: 'ZZTong-Prefabs'
2023-01-15T15:25:13 8.877 INF [MODS] Loaded Mod: ZZTong-Prefabs (20.6.013)
2023-01-15T15:25:13 8.877 INF [MODS] Initializing mod code