Very sorry to hear, here is wishing you both the best.
For the last 2 years I have a home concentrator, long line, centerally located, works well for single story.
Mobile is a POC, depending on the flow and if is on demand or fulltime determines its tike. Mu unit has provisions for AC while charging and using. Also came with car adapter. Also mine has theoversize battery almost doubling its use time.
I did discover the carrying POC for short distance showed me how week i had become. Shopping carts or buddy can be real friends walking around in walmert.
Im sure the doc will suggest you exercise/yoga. My exercising started out just try daily activities, such picking up a bookbor magazine and around the rooms till i could walk with no labored breathing and no 02.
The chemo really can take major toll on the body, the treatment the effect become accumulative. Stay Positive, Stay Strong