HMC928LP5E phase shifter solder implementation question

I'd like to make a phased array and using HMC928LP5E to control the excitation phase delay. The phase shifter will be soldered on a CPW. I noticed on the data sheet it says "vias under the device are required". right now I am only able to connect the ground pin of the phase shifter to the CPW side ground and will not have vias connecting the center of the phase shifter. Is that still ok? Thanks