First off, go over to Garage Journal and ask there. There are endless threads on garage scissor lifts. That is where I found my inspiration to order a Bendpak MD6XP and have a pit. I decided to pay for some pros to dig my pit, haul off the debris, and line it with 2,000 PSI concrete and let them lay in the reinforcing rebar.
I had them cut out a trench so I could mount the pump on the wall, and bring 110 volts to the pit.
I mounted the pump on the wall to get it totally out of the way.
I have had my 911 on it many times, and I will put it in the air just to do electrical work or simple tasks at a level I don't have to bend over.
I use a piece of 1/2 inch plywood to cover the lift and pit when not in use. It is 100% out of the way when not in use, and it is wonderful to use to lift up my lawnmower or any other thing to work on.
Just behind the heater or the air conditioning in my garage I love my lift as a third best upgrade.
Id the lift 10 years ago in 2014 and it has been flawless.