I had the Flymount for a brief time but never really liked the wing tip mount video perspective for my riding style; frequent moves where wing tip is constantly going from high to low position and back again (gets tiring to watch a wing tip perspective on video). Always preferred mounting my Max at the back of the center strut. This is just a quick-and-dirty snap-on boom mount (made with stuff lying around the shop) without any concern for making the mount invisible. Could have made a 2nd improved iteration with an invisible mount but was just too lazy

. I'm sure it would work for hard handles.
Suppose you could also take the flymount concept and do the equivalent at the rear tip of the center strut. Could also mount the max right at the back of the boom or hard handle with even less swing weight added (no extension rod required), but the cropped reframed final video gets a bit more distorted the closer the cam is to the desired reframe action. Always trade offs. And yes, it adds weight for luffing. When well powered it's fine, when way underpowered it's a bit of a pain. No one wants to wing underpowered either way.
Side notes: the Max lens mod for the GoPro is a nice option for existing GoPro owners (way better than a stock GoPro on a helmet or mouth mount) but it doesn't come close to the versatility of the Max itself imho. Also a 360 cam works great for mounting in a fixed location and you just wing around it (you essentially pan when reframing). It wouldn't work in surf or downwinding, but for flatwater stuff it's pretty cool. It hardly ever gets used that way but I love that perspective.