There are several Gridfinity holders for the Dymo LetraTag, but all I saw are horizontal. This is ideal for maximizing space usage on tall drawers.

The fit in the design is not perfect, but is quite decent, the Dymo printer stays firmly attached and does not move.

Recommended to print in a material softer than PLA, like PETG (the one I used for the print in the photos), to avoid the hard PLA making scratches in the printer body.