+1
Otherwise they're not super useful and aren't really worth making over other AT options, but at least it'd take micro to use.
What if you removing firing through blockers entirely, but increased their range to 120? (+50%)
It'd then be about giving them the biggest sight lines possible rather than literally building them behind houses.
Their brittleness also wouldn't matter as much with ranges like that. You could make them both decrewable no-brace units like the Pak 43 is now.