we use both what trec-r posted. transport risk is killer, they offer full coverage down to liability only. They even offer product liability on uav parts which is hard to find as well.. Killer company, the boss has a phantom and is hooked. They also offer red waivers for minimal fees so your payload is fully covered as well. The problems with them is it is each individual aircraft and gets spendy. The aircraft gets a barcode and all the gear is stickered. each additional is a whole seperate deal
Aerialpak is good enough for a liability only policy carrier, They seem a little more beat up from offering policies on this stuff for a while but they seem true. I know a guy that's recently had a claim through them and it all went through, kept his livliehood in tact. They offer full fleet coverage under one small policy so to just get in the door with additionaly insured papers for gigs works easily and cheap
Transport risk loves hearing kloner sent ya, usually gets you in a little easier than not