Rotor rings on trikes

[MAVERICK13]

Does anyone have any experience of or know what position to run Rotor (elliptical rings) on a trike (it's a WC)?
On another note has anyone converted to a tubeless setup to help reduce the frictional loss (tyre/tube) of having three wheels?
Thanks!

[LMT]

If you get the QXL rings you can only run them in three positions, I prefer number 4.