I saw both mounted on a boat in a slip on Yellowstone Lake, though I didn’t speak to the owner about it. Before having Permatrims, I used Macs River Runners, which are similar to the Hydroshield, mounted on the skeg. These did give a small amount of stern lift, while protecting the prop from medium hits, but added additional drag costing it, it seemed to me more top-end speed than, the Permatrims. That said, I too have considered running them both, but from all my investigations if done it would be a Permatrim with Macs River Runner. In consideration, it would be for prop protection, not added trim performance, as my trim tabs & Permatrims are plenty for that. Also the Hydroshield mounted on the skeg sits so low, that in my opinion, any hit on a hard bottom at speed will likely take it off & with it part of the skeg, that could have not been a hit at all without it. While using Macs River Runners, which are designed more for just prop protection, I did just that. The Mac River Runners did save my props several times on the Yukon River & other places & if trying the combination it would be with them instead of the Hydroshield. Few & maybe you are one that the positives would out weigh the negatives. I would have to have future plans of much running in shallow uncharted waters to go beyond the considering at present.
