I'm interested in [shadowless product photography](https://photo.stackexchange.com/questions/14991/how-do-i-properly-do-shadowless-product-photos). My current setup is a tent:
[![tent](https://i.stack.imgur.com/o1j6K.png)](https://i.stack.imgur.com/o1j6K.png)

It came with some backgrounds but they have horrible folds and I just can't iron them out, so I'm using a thin wooden plank with white foil on the bottom. I use three speedlight flashes (two on each side, one from above) and the on-camera flash with a difusor (mostly as optical trigger).

The pictures look good, and the flashes produce a much better light than the spotlights which came with the tent, but they still have some shadows. Here is an example:

[![testshot](https://i.stack.imgur.com/b63UB.png)](https://i.stack.imgur.com/b63UB.png)

Another example with better exposure:
[![testshot2](https://i.stack.imgur.com/qN9bR.png)](https://i.stack.imgur.com/qN9bR.png)

Even more light, too much for the subject, but still shadows visible:
[![testshot3](https://i.stack.imgur.com/bMsG3.png)](https://i.stack.imgur.com/bMsG3.png)

Please ignore the unclean surface and reflection, that was just a test shot.

I'm looking forward to shoot a huge inventory, and I would like to have little to no post-processing at all, therefore my goal is to get a perfectly white background with no shadows out-of-camera.

I came across this [very promising looking product](https://www.aliexpress.com/item/-/32867710983.html):

[![illuminated bottom](https://i.stack.imgur.com/ixeZB.png)](https://i.stack.imgur.com/ixeZB.png)

The example pictures on the AliExpress listing look amazing, but you generally can't trust those. I couldn't find anything on youtube to demonstrate such a plate, that's why I decided to ask here.

Has anyone here ever used one of those? How does it work out? Would this give me my desired results? Is there anything else I can improve with my setup?

I also have a ring flash, but it uses LEDs and they aren't able to trigger the optical slave flashes. Is a ring flash worth upgrading to a 2.4GHz flash setup?

Edit: Would really appreciate some input on the bottom light and improvements to my current setup!