Welcome to our community, @Hy7fhs!
Are the following ETFs the ones you are mentioning?
ProShares UltraPro Short QQQ ETF
NASDAQ: SQQQ
ProShares UltraShort QQQ
NYSEARCA: QID
ProShares UltraShort S&P500
NYSEARCA: SDS
If they are those, the US domiciled ETFs aren’t allowed in UK and EU. Only ETFs domiciled in EU/UK that follow UCITS legislation are allowed to UK and EU investors.
If you want to short and/or leverage indexes and stocks, T212 have ETPs (similar to ETFs) that you can invest, but beware their specific conditions (short, leverage, daily impacts).
Please also see the below topic to know what are the financial instruments eligible in T212 (UK and EU):