Submersible is quieter than a perdistal pump.
Get one with a float that slides up and down a post at the side of the pump opposed to one with a float on a flexible cord that connect to the top of the pump.
Reason - the float on a cord ( if not installed just right ) can easily hang up on the side of the sump pit and prevent that float from turning ON the pump.
While you are at it - clean the crap, debris, muck, etc. out of the bottom of the pit.
In other words - below - sure - but only if you position the pump in the pit so that the float does not get hung up on the wall of the pit. IMO, in the photo the cord between the pump and the float is set a bit too long. I would suggest you shorten that cord using the clamp on the pump. This will make it easier to install and keep the water level lower under the home.

This one below - YES.

In the Godfather movie - the old cop says - "I've frisked a thousand young punks". Well I can say - "I've fixed a thousand screwed up sumps".
