The reason I'm using 2 receivers is for the extra channel output. Since I'm using matchboxes to handle centering and endpoints of the servos, I can use the aileron and aux1/flap outputs in each receiver eliminating the use of y-connectors.

In my H9 Ultimate I have the top left wing going to Rx1 - aileron, and the top right wing going to Rx1 - flap. The bottom left wing goes to Rx2 - aileron, and the bottom rigth wing to Rx2 - flap.

Quique only used 1 receiver at the TOC last year and his Yak has 17 servos in it.

-Doug