Yes, crash could be awesome if you got luck, I also chickened out seeing x10 already.
The highest multiplier I won in a crash is only 100x but I bet it from 3x, 5x, 10x, 25x, 50x, 100x in a single roll since other site's crash have an option to bet in multiple in a single game and I hit them all. I almost got nervous to the point of cashing out before it even hit 50x but then, I just let it finished since I already got even with winnings when it hit 25x, lucky it didn't crash before 100x.
With regards to x348 haven't gotten to that level as well, since playing at Chips.gg probably the biggest win I've got from slots (Genie Jackpot) was like x20 only, so it's really based on extreme luck, for Dog House though, it is not available on my country, so never got the chance to try it.
Same here, some provider such as Pragmatic Play is not available in my country too. With regards to winning, I haven't hit a huge multiplier in Chips either.