One of the best I have used is connecting the camera to either my iPhone or iPad Pro with Canon Connect. I especially like using the iPad because I have a very good image on the iPad display. However, I know that is not what you were asking. I have other shutter releases and none work as well as my phone and tablet.
I also have a 70D along with other canon cameras. The Vello Freewave, RW-CI Remote will work just fine. In fact this remote does not need line of sight to work. You can shoot through drywall into other rooms.
If you want to reply, then
register here. Registration is free and your account is created instantly, so you can post right away.