I sat down with the official printout of the game floor (the one posted above), and took a close look at the relative spacings, alignments, size of the game floor tiles, and so on, and decided that it looks like the edge of the colored tape that is nearest to the game floor perimeter is roughly six inches away, so that’s what I did. My tape lines that are parallel to the game floor sides are six inches back from the outer edge of the walls. As you look at this picture, the right edge of the blue tape that is in line with the white tape on the game floor is aligned with the left edge of the white tape, and that is mirrored with the red. The blue strip that is perpendicular to the white tape strip is placed so that the left edge of the blue tape (as you face the game floor) is aligned with the right edge of the connectors on the two floor tiles, again, mirrored on the red side.
This is probably a bit of overkill, but we hope to participate in some virtual competitions in the near future, and this will be our first time competing on a game floor that we set up ourselves, so we want to make sure that it’s right.
Thanks for everyone’s input!!