E&O covers mistakes you make. GL covers injury or damage. Lot’s don’t carry E&O because of cost. However once a lawsuit takes place due to the HI’s negligence that’s when reality kicks in and they wish they had it. Make your decision from there. Do a search you’ll see all kinds of info on this.
The last CE course I attended, the instructor asked how many carried E&O insurance. Out of 98 inspectors there, only 8 raised their hands. I do not carry E&O ins.