If you want to place torches and lanterns on slabs, this mod will allow you to do so.
Torch Slabs 1.19, 1.18.2, 1.17.1 and 1.16.5 allows players to place lanterns and torches on slabs of different materials. This, which is not possible by default, can be done on the top, bottom and side of any Minecraft slab.
With this mod installed, we can also place torches and lanterns added to the game by other mods on the default slabs in Minecraft. In the same way we will be able to place lanterns and torches on any type of slab that is added to the game by another mod.

How to install Torch Slabs Mod for Minecraft?
- Download Forge
- Download Torch Slabs Mod
- Double click on the downloaded Forge file to run the installer.
- Paste the downloaded mod file into the .minecraft/mods folder.
- More construction versatility in terms of slabs, lanterns and torches!