Assuming you mean the Phottix Laso TTL Flash Trigger Receiver (For Canon) it should work. (Do note that at the link in the previous sentence Laso discloses that the receiver you are considering is not compatible with Multi flash. Multi Flash is what Canon uses to describe a sequence of multiple stroboscopic flashes fired while the shutter remains open for a single exposure. It has nothing to do with the number of flash units you are using but rather with the number of flash pulses used for a single frame.)
The Yongnuo YN-E3-RT is a clone of the Canon ST-E3-RT and is supposed to be able to control any radio receiver that can be controlled by the ST-E3-RT. It reportedly works fine with any Canon produced radio receiver built into Canon's RT flashes.
You might run into compatibility problems, though, if the YN-E3-RT transmitter and the Laso Receiver are both reverse engineered in slightly different ways. The only way to be sure would be to test the combination. It will most likely work. But if I were in your shoes I'd be sure to order the Laso from a seller, such as amazon, that allows returns for any reason within 15-30 days of purchase. I'd also be sure to test the combination in every conceivable usage scenario for which you plan to use it before the return period is over. For example, you may find that it works as expected in TTL or Manual mode, but doesn't work correctly in Group mode (or vice-versa).