NFPA 505 talks about protection of chargers in #3 below, but this could be done in a number of ways, not just putting it on a stand.
8.3.2.1 Facilities shall be provided for the following:
(1) Flushing spilled electrolyte
(2) Fire protection
(3) Protection of charging apparatus against damage by
trucks
(4) Adequate ventilation for dispersal of fumes from gassing
batteries
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