Connection protocols to enable external drives to connect to late 2015 27-inch iMac I need to connect two 4TB or, better, 5TB external drives to the free Thunderbolt 2 port on my late 2015 27-inch iMac, hopefully daisy-chaining these new external drives together so I can use just the one free Thunderbolt 2 port.

(The machine does have 2 free USB 3 ports as well, but I'm guessing that these would not be as amenable as the one free Thunderbolt 2 port for this proposed external drive expansion requirement.)

I'm not seeking brand recommendations here, just advice as to the possible connection protocols that will enable 2 5TB external drives to be connected to this single Thunderbolt 2 port - if they exist.

What would be the fastest drives/connections to do this, hopefully keeping the external drives bus-powered?
I’m a big fan of using a dock or enclosure to reliably connect drives rather than chaining them. Cable chains can be safe and secure and work well, but I prefer one cable and hard mounting the drives:


https://eshop.macsales.com/item/OWC/TB2U3DKR2/


Most basic enclosures work in JBOD mode since you don’t usually want to RAID / mirror less than 5 drives or without a nice controller for most uses.