My average number of tours per week can vary from 10-20 during a peak period - it shouldn't be down to me to check every opponent that hasn't responded alongside any tour preparations and other commitments I have.
Any opponent that hasn't responded on my wall I wait until Sunday evening to claim act, and my Discord is always accessible if needed.
In terms of tagging, I've not seen anyone else do this, and we've played against each other in tours previously.