The +1x or -1x is not really a leverage at all.. if the ETF moves the same percentage of the underlying stocks.

A real leverage ETFs are the ones that moves 2x or 3x or options (can be up to 50x) of the underlying stocks.
I think better to buy/short on the real US ETF like QQQ. Why?  Because they're real time and with liquidity in US  exchanges. Bursa got little or no volume at all with those ETFs. Looks like the broker/seller the same market maker.

But... good luck with your long (bear) positions on FANG-1. Hopefully you can make money!