Which brokers giving Cover Orders, with LIMIT Price ?

can somebody enlighten me about SAMCO as they advertise 20x margin facility. But I find some ambiguity. suppose I sell one lot of nifty say 11000 pe and ce both and say banknifty 22500 pe and ce. both of weekly expiry. How much margin will be required.
Thanks in advance. I m not considering intraday trade for the above.

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