How would a 2D model of Hotelling's law outweigh the benefits of a 1D model?
There are several scientific papers analyzing this on topologies other
than the unit interval. A 2D example is Spatial competition of firms in a two-dimensional bounded market by Aoyagi and Okabe. Unfortunately there are usually no equilibria in these cases. The intuition behind this is that the consumers arriving from different directions are usually not "balanced", and one could gain by deviating to a direction where a higher number of consumers are coming from.

Also, Hotelling models are not used in practice (to my knowledge) when one is assessing where to open a new shop.