I use the Three Legged Thing Alana carbon monopod, which holds plenty of weight and is solid fully deployed. It takes strain off my arms and back when standing for an extended period of time, especially with the Z9 / 180-600 combo. I got their Doc Z deployable foot but I find it is fidgety and it adds carry weight, and would never trust it to hold my camera set up without keeping a hand on the monopod or camera. I was also paying too much attention to my own feet, and uneven surfaces were problematic. So now I just go with an inexpensive spike foot with removable rubber cover and a monopod head up top. For carry purposes, I added a size-matched ring that has a QD socket onto the monopod shaft (Leofoto, got it on Amazon, see photo), and I use a Magpul dual QD strap (one plug goes into the camera plate, the other goes into the ring adapter). It is a good set up, for times when mobility is important, and it's very easy to pop the camera strap on and off with those QD plugs. Obviously a monopod will never be as stable as a tripod, but the set up is useful and it really helps with back fatigue. It's also nice when sitting or kneeling for a while using that heavy camera/lens combo.