Saftey regulations of multiple 1mW lasers
Laser products are classified on the basis of the highest level of
laser radiation to which human access [1040.10(b)15)] is possible
during operation only. Other laser radiation fields to which human
access is necessary only during maintenance or service do not affect
the classification but may affect the labeling and safety interlock
requirements. Use-factor data, if available and adequately convincing,
may be used in determining the level of laser emissions from a
product.

Source: https://www.fda.gov/regulatory-information/search-fda-guidance-documents/compliance-guide-laser-products-fda-86-8260
With this in mind (more specifically the highest level of laser radiation to which human access) the FDA would probably class a 5x 1mW device in the 5mW class. Because 1mW x 5 focused on one point could potentially expose a human to 5mW it would be classified as 5mW. So not a good way to try to 'get around' the laser classifications. The best person to ask would be a saftey compliance engineer/consultant that has actually certified these devices.