Hold half as much in a 2x as you would the non-leveraged, or a third of the $ amount in a 3x leveraged ETF as you'd hold in the non-leveraged.
More in 'cash', and if that cash does well (higher reward than what the leveraged ETF pays to borrow) you're quids-in.
Another benefit for 'aliens' is that dividends are taxed at 30% (US dividend withholding tax (reduced to 15% under UK/US tax treaty if known to the US (W8BEN)). Often leveraged ETF's pay less dividends, a form of dividend mapped to cash (which can be held domestically more tax efficiently). i.e. tax efficiencies (lower costs, higher reward).
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