Been playing around with obj/mtl and multiple textures - all works pretty well.
This virtual gallery template is a medium sized template (It has 13 placeholders) to showcase your images.
To use it, download the zip file and replace the images in the images directory with your own and you are ready to upload your krpano project.
VR ready and you can navigate with keyboard or mouseclicking the floor.
Edit 09/05/2023: now available through gumroad (still free):
Have a good weekend!