Strap+dildo for F that can stimulate the clit/vagina

We purchased this toy:
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and it’s not good…
it’s okay for bj, hj, and reverse cowgirl and the stimulation is amazing for both of us.

We tried doggy style (what we wanted to do at first place), but we never managed to do it:
-or the toy slide outside of her
-or she can’t manage to put it inside me (even if i try to guide it). the “dick” part “slide” and we never actualy managed to do a proper penetration.
We already tried this position with a “conventional” strap, and there were no issue.
We tried to put the dick part inside of me first, then the vagina part… wasn’t good too (slide outside of her)

Thanks for any recommandation (for an other toy or how to use it), this is very frustrating for both of us…

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