I have 2 eufy robovacs. The original was a 15C like yours, it is on year 3 ( I think ) of service. I did have to replace the battery, and both brushes a couple of times, but it does a fine job of bouncing around randomly and picking up dust & dog hair.

However, my home environment can be challenging (due to pets), so I moved the 15C upstairs and got an X8 for downstairs. The X8 maps, which means I can mark off areas I want it to skip or give it specific rooms to clean. I haven’t found any way to get that functionality in HA, that’s only in the app. There is a HomeAssistant integration for Eufy vacs, I have been unable to install HACS, so i can’t weigh in on that yet.

For the 15C, you do need to keep the floor clear and I recommend placing the recharge base in a wide-open area at the perimeter of your house. There is a radio signal in the base the vac uses to home, and that can cause some confusion if the base is centrally located and/or near some interior walls. My 15C kept getting stuck in a closet because the base station was on the other side of the closet, so it just homes on the signal and then dies of low battery.

Remember to empty it every day for maximum effectiveness, and blow out the filter occasionally (OUTSIDE!) to get rid of that crud. Once a week, flip it over and clean the roller out, including the ends. Junk gets caught on the axle of the roller and will wear out the roller housing, leading to an unpleasant squeaking noise. Prevent this by removing debris from the end of the axle regularly, and when the squeak does start, apply a small amount of teflon tape (the natural gas version works better than the water version) to the end of the axle.

Having it run while you are away is a great idea, it can be a bit noisy.