Electrical – Can an outlet for a dishwasher be located below the floor

If your circuit breaker isn't tripping when the old or new dishwasher ran a full cycle, then hardwiring won't change a single thing. Check that your drain hose is clear & run up to above the sink trap or underside of the countertop.

There should be quite a forceful stream of water visible in the garbage disposal or sink drain. If not & you have an Air Gap atop the sink, then take the cap off the Air gap (dishwasher off) & clear all debris. You'll need to snake something down the hose leading into the garbage disposal or sink drain until you can see it come out in either. Correct any hose under the sink to be as inclined as possible above it's connection so future flow-back is eliminated.

And, especially check that the bottom of the dishwasher's inside grate or strainer is clear...if clear glass ever broke in there you really won't notice it blocking the water exit. Also, if you wash food product jars without completely removing labels, they will gum up the works quite badly & quickly.

All this should get you back in tip top shape. A new dishwasher doesn't fix an old or worsening clog.

It is possible that you have a bad outlet before the freezer. Many times contractors use the push in connectors on the back of the outlets called "stabs" (I think they should be outlawed). These knife edge connections don't do well with loads like freezers because they draw a large starting current. Start by checking the outlets close to the one that powers your freezer since you just replaced that outlet. There are usually several outlets on the same circuit the problem could originate from a working outlet that the load side stabs failed. I work my way back to the first working outlet on that breaker check it, then check the next one that is dead. It has been this almost 100% of the time. I have repaired well over a hundred over the years Only 1 or 2 had loose wires at the breaker and there one that the outlet was covered with sheet rock. If you don't find it you may need to hire an electrician that has a through the wall scanner to find breaks behind the walls with a tool like a Greenlee CS800 but these are expensive and not something a home owner would use very often.