You can use the OpenVR Advanced Settings plug-in to force Chaperone boundaries to be visible at all times.
Once installed a new Advanced Settings menu will appear in SteamVR's dashboard
Go to the Chaperone page and turn on Force Bounds
There are also additional settings that may help you, such as marking the center of your playspace or proximity warnings ...
Besides the risks of installing anything from unknown sources online (not to say anything about this source in particular); it does not appear like you should expect any repercussions at this time.
Beat Saber is well aware of the modding community, and so far as not taken direct action against the community. Some new patches seem to break mod support; but ...
During Room Setup, you will have 2 options for the kind of room configuration you want to set up: Room-Scale and Standing Only.
You will only get the option to designate room boundaries in the Room-Scale setup path. It seems that you can't designate walls if you choose the Standing Only path.
In order to find previously visited place you have to place some kind of marker on it. Marker could be starship, other vehicles, registered base, save beacon, save beacon on NPC bases. Or the analysis visor shows you coordinates on the right side. (Btw. I lost some NPC's before I learnt how to use Save Beacon, it sadly happens.)
Aside from turning it on inside SteamVR menus, you may have to enable access to your camera through Windows 10 system settings menu:
To find this setting page just type "camera" after opening the Start menu and you should get a link to it. Flip the toggle button to On in the "Allow apps to access your camera" section. This should be enough. Because SteamVR ...
This can be due to one of two possibilites:
The tracker is too far from the headset
There is no direct sight line between the headset and the tracker
Make sure it's close with nothing blocking the sensor.