When I enter the depreciation for all prior years, I'm looking at the 2019 depreciation table.
No. Don't look at "any" tables. Look at the 2019 form 4562. On that 2019 form 4562 add together the amounts in the "prior years depreciation" column and "current year depreciation" column. Enter the total on your 2020 tax return where it asks for the total of prior year's depreciation already taken.
