With PC you mean Windows PC or Apple ?
Sorry, I do not use Thunderbolt. I just googled for you. For a PC it seems to be an adapter like this here: https://www.amazon.de/StarTech-com-Thun … B019FPJDQ2
For Apple its usually something special from Apple.
As RTL (round trip latencies) with USB3 is not worse, see tabular below ...
With USB3 you could even use 5m (!!!) long cable between PC and UFX+.
I have here Lindy cable (which has three shields) and 5m are running like a charm.
It allows you to position the UFX+ much more flexible and the cables are not so expensive. No must .. just an idea.
There is only one difference between USB3 and Thunderbolt driver for the UFX+.
The thunderbolt driver allows for "pitch", the MADIface USB driver not.
So if you need the pitch feature (which was also available for Firewire), then you require thunderbolt.
The 5M USB3 cable from Lindy (Cromo line), which I am using:
https://www.amazon.de/dp/B07F6WHVLH/ref … E_SCE_dp_1
UFX+, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1650v4, Win10Pro22H2, Cub12Pro