I have something similar to the early grow(mine is much smaller with 9 individual slots that I can fit 1”x1” rock wool into...it works. The second like seems like it would work fine better than mine because you could just fit a whole sheet of rock wool in there with out cramming them in and then having to pry them out, I like that I can change the humidity and had great results overall. I liked mine because it had 2 chambers so I could just fill water in the bottom and then it would creep up the rock wool. Let me know what you go with! Good luck and happy planting. This is what I got https://www.amazon.com/Seedling-MIXC-Propagator-Germination-Greenhouse/dp/B07L4B5TMW