The Andycine box actually is waterproof and I used it for my IEM's (The one I have isn't branded Andycine). I only got the alen key though and nothing of the rest you got.
Perfect timing as I was after a mount for my new monitor. I ended up with a Wooden Camera Ultra Arm Mini which I love as it’s so well made and very flexible. The modularity is what made me spend the extra as there are so many options for pretty much any situation.
This video was definitely interesting but my concerns about this arm are... Is this think... One handed user-friendly to change positions of a monitor? Maybe small rig or andycine is better for that.
I have the T7 as well, with the Nitze cage & sunhood. I went with the Nitze N54-G1 tilt/swivel mount, mainly because the tightening ring/nut for the shoe mount has a built-in lever, so I can tighten & loosen it securely without needing an Allen wrench that I'll lose. It was $30, so in the same price range as the two tilt/swivel mounts you compared. It also has Arri pins on the monitor end, which is nice, I find that the plain screw mounts always loosen and spin at exactly the worst time. Personally I find magic arms to be really frustrating when shooting anywhere but on a tripod, since you need two hands to adjust the monitor with them. Their range of motion is nice I guess, but I rarely want the monitor in a different place, just at a different angle.