I Euro nymphed exclusively for a couple of years with a (wait for it...) A Tenkara rod. Yea I know but it sure was effective at 13' long! Caught some good size trout in fast currents too.
I eventually missed casting a fly line so started using an old Cortalnd glass rod that led me here, but I digress!
I tried a mono rig but that was miserable to cast. Maybe it works on an actual Euro nymph rod but I'm not spending the money to find out.
Anyway if you're curious about Euro nymphing get a Tenkara rod. You can get a decent one for around $100. They're easy to carry with you and whip out when your get the urge to drag nymphs, hah!
I have found that my tenkara rod brings the most hookups for me when fishing this way. However, when Euro-Nymping in the local Gold Medal water, I have failed to land several fish (>16”) that are just too powerful and whose runs snap the tippet of a fixed-length tenkara line.
So...I found a 12’ graphite rod from China that has a reel seat. Can’t fish it all day because it is a bit heavy, even as a graphite rod. But, it brings the reach needed for tenkara style fishing with a reel which can let a big fish run when needed.
This is, however, my least favorite fly fishing. But, when the fish are deep and sluggish during the winter, I can frequently bring one to net. But...give me summer small-stream fishing, on top, with a shorter glass rod any day!