I have been nearly taken out several times as one has climbed through my level without seeing me.
Climbing in any aeroplane is dangerous regardless of whether the wings are in the right place or the wrong place. I don't know many low wing aircraft that can see behind them when climbing either!
TCAS/FLARM isn't the solution here. Have some 3,000 odd hours in that area. Know it very well - always busy even when the weather is not as good as it was today and the only solution is a good, solid (well taught) and
continual lookout.