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After the tables had been placed and the placemats arranged, I removed the tables temporarily, leaving the placemats floating in midair to serve as placement targets.
In the course of this project, I discovered that every table in the game is a slightly different height. To set the drums at the correct height vs. the briarwood dining table, I used a faydark tavern table. But save yourself the 15 trips to the broker to buy different tables I did - purchase a selection of tables ahead of time to have on hand and experiment with!
To place the drums, place a lower table under the placemats, and set the drum on that, centering it on the placemat. The faydark table was removed after, and the briarwood tables carefully replaced.