Hi Strebor and welcome to the RShake community,
I recommend the approach PhillipPeake mentioned. Try each location for a little bit to see if you get the results you are looking for. Ideally, you want the ‘quietest’ location to try and capture those small or distant quakes. You may want to try a week in each location to see how day compares to night and how weekends compare to weekdays.
I initially, had my shake in the garage on the concrete floor. It performed well there. However, it was close to the street causing big spikes from cars. The furnace added noise. Walking in our of the garage… more spikes.
So, I decided to move it to the backyard. No bedrock here, but I did dig down a little to reach more compacted and harder clay. With the new location, traffic noise was greatly reduced. Fewer footsteps and no furnaces issues. You can see what I did in the Vault Archive links Branden provided.
I still pick up various cultural noises: Washers, dryers, swimming pool pumps, a/c units, trash trucks…etc. However, my location has reduced them as much as possible.
RS4D Chino Hills, Ca