Everything you see in the videos is in a prefab format.
About Flames, the package has a shader and a visual effect in case you want to make your own flame and we have also eleven (11) ready-made stylized flames.
About Fire_Props, there are actually five (5) floor mounts, two (2) wall mounts with a torch, and two (2) hanging mounts. Hanging mounts have one (1) chain to hang from the ceiling or one (1) standler to hang from the wall.
About prefabs, there are in URP mode in 2k & 4k resolution. You can find the Fire_Props with the Main_Flame for more common use and in a costume form as example of the posibilities you have with this package. The Prefabs are just drag and drop and you have the asset in your scene. (You have to enable from the Package Manager the "Shader_Graph" & "Visual_Effect_Graph" and from the Preferences the "Visual_Effects -Enable (Improved_Shader_Graph_Generatio & Experimental_Operators/Blocks)"