Advice on a First Time Build

I am interested in making a tree house for my kids. Nothing too complicated, basically a platform around a 30" in diameter oak tree behind our house. I have carpentry experience, but this is different than anything I've tried before and I want to make sure I'm doing this smart.

I've already had an arborist come out and look at the tree and assure me that it is healthy and a good candidate for this kind of project. I was planning on using 2x10s as the joists with 1x8 planking. My real question is the tree hardware. I was looking at using something like this

https://store.beinatree.com/collections/tree-fort-hardware/products/treefort-static-yoke-treehouse-hardware

But I wasn't sure if I would need two on opposite sides of the tree to create a stable support for the structure, or if just having it on one side and building off of that would be enough support.

Any feedback would be greatly appreciated!