Bow anchor. Never in much current either. As you've learned, it doesn't take much pressure from current to make dangerous things happen.
Sit as close to center as you can when soloing in a tandem. Depending on your boat model, you can get snap in seats or something like a clip in hammock sort of seat. A lot of people flip the boat and sit 'backwards' in the bow seat (which is now the stern).
Also instead of an anchor, if you are fishing in mild current, then a drag chain may work for to just slow you down some. Hang a drag chain off the stern. It'll keep you bow down stream and moving slowly, allowing for some nice long drifts.
Classic Freestanding Rack
Pull-Up Strap Handle Kit
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