Relay questions for electrical gurus

Adding some rock lights to my rear rack set up. Bought some Sunpie rock lights and they run 9W and 8-30V per their information sheet. Plan to use a Air on Board switch which is rated at 3A. Need to use a relay-I understand this and can wire this up no problem. What I am confused about is the vast array of relays available when I look at Amazon or DelCity. So, what I want is a nice water proof 4 relay box (for future expansion-I need two right now for my project.) However, that doesn't seem to exist... so do I buy individual relays? What is a good brand? Any advice would be appreciated here.

 

I'd probably pick up one of these, or go find one of the Blue Sea ones.

$22 True Mods 12V DC Auto Waterproof Fuse 5-Pin Relay Box Block [6 Bosch Style Relay Holder] [6 ATC/ATO Fusible Holder] Universal Relay Block Box for Automotive Vehicles Cars Marine Boat Light Equipment

https://www.amazon.com/ONLINE-LED-S...ords=blue+sea+relay+box&qid=1605836466&sr=8-3

Then you're looking for bosch style automotive relays. There's probably a million brands, i'd just pick one that gets decent reviews and go with it.

 

https://www.waytekwire.com/item/38553/GEP-Power-Products-FRH-A24-Compact-24-Way/



TPA = Terminal Position Assurance (lock)
CPA = Connector Position Assurance (lock)

 

These are the type relays (280) that fit the 24 pin base (GEP_FRH-A24)