Small cuts in sheet steel or somewhat thicker material such as stainless steel tiles may be easiest to make with a grinder or a rotary tool.
How to cut holes in stainless steel sheet.
Secure the steel sheet with clamps.
You can even put a support board beneath it to avoid teardowns.
Use an abrasive cutting wheel made for stainless steel.
Cut the stainless steel first method.
Watch out for overheating.
Use a center punch on the hole center to create dimples in the area.
Cutting with a hole cutter.
The plasma cutter is best used for cutting through thick sheets of stainless steel.
Put some cutting lubricant in the center.
Steel hardens with heat.
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Just like cutting vinyl siding for your home tin snips work similar to a pair of scissors.