By Multiple SoundTouch speakers are you meaning to get surround sound for the projector? If so, then no. Each Soundtouch speaker will only provide stereo sound. So the front left speaker will provide Left and right, as will the front right etc.
If that's the case you are best served with the SoundTouch300/Soundbar700 to start the package and then add rears and Bass if you need them. However if the projector doesn't have sound pass through, you will need to split your source so audio goes to the bar.