- Main mount (you bolt it on the printer carrier) 3 types of main mount , side probe position (left and right) front probe position (left or right) and no probe at all. Here is the main mount, left hand "Z" axis probe positioning; at 90 degrees.

To be bolted on the machine carier you have, once and for good, depending on your machine you will have to figure out alone what you need in therms of nuts and bolts and how to do it (might imply some drilling and threading in the carrier or in the main mount 3D printed part).

For the price you have one  main mount, left hand "Z" axis probe next to the hotend, that makes the measurment taken to be milimeters from the nozzle tip improving precision in mesh probing.   You need to buy the M4 or M3 nuts and bolts, drill the eventua holes and tap where needed.

Word of advice from experience, PLA will fail in time due to proximity of hot elements like heated bed or the hotend, but can print in an open printer frame over 100 hours before it fails sometimes.

If you intend to run your printer on the hot side of polymers do not go for PLA, rather nylon, or PPS or similar, if you intend to go fully enclosed and really hot polymers in printing, I reccomend you go PEI or PEKK.