What inspections do investor purchasers typically order?

[Joel Zwemer]

I have a contract on a single family residential property located in South Florida intended as a rental unit.  It was constructed in the 1950s.  I ordered a standard inspection and the inspection firm immediately recommended that I also order a sewer camera inspection, which essentially doubles the cost of the inspection (still less than $800).  I ordered the additional inspection. I am curious to know if others think that such an inspection is warranted and what other types of inspections investor, purchasers order.