real talk,. for plat camp.
Paineel guards uncontested with zero rng is 1k plat per hour, vendor food.
Seafuries with good rng is top dog, more then 1k plat per hour from vendor food.
I've always read about Kelethin guards but never got around to trying them out. It always seemed like it would be a pain to navigate that city.
For people who can FD Kaladim has a boat load of guards in a pocket to the east. (south kaladim, 12 on the map) Combine those kills with guards at the entrance. Find a lowbie dorf to sell for you. (You can bank as any race in kaladim)
It's probably close to the paineel plat per hour. My math was something like 900~ plat per hour via kaladim guards.
Kaladim guards are not terrible exp, can go 55+ from them as well.
Edit: Grobb guards (the ones inside grobb)
Troll guards in Grobb are also good, I almost forgot about them. Plat and exp. I've seen enchanter doing awesome in there.