On a boom, a rubber band mount will be better than the supplied shock mount.
On an A7, using the EVF could be problem as you will need to push the mic forward to avoid poking your forehead behind the hotshoe. This could send your mic into view of a wideangle. A flash bracket will be better place to mount the MKE on camera
Have you considered a Shure VP83F?
It works with any camera, even those without mic input.
Pair with Sony ECM-AW4 for wireless monitoring or recording.
Combined, the VP83F and the AW4 will take care of 99% of contingency situations.
Yet everything fits into small waist pouch and can even be boomed off a selfie stick.