SM - Cash Damming Rental property - how to claim interest?

have leveraged the smith maneuver to bring bad debt to good debt. Basically, took my rental income to pay off my principal home mortgage every month, and then borrowed on my principal heloc ( line of credit) to cover all the expenses on my rental. This resulted in about 5K of interest from the borrowed funds. Now doing my taxes and am confused where I claim this interest, do I claim it under line 21000 (interest paid to earn investment income ) or do I claim the interest on line 8710 of T776, which is interest costs of the rental property. Typically line 8710 is the interest paid on the rental property mortgage, or lines of credit associated to that property. But since the extra borrowed money is now coming from my principal residence heloc, do I claim that on line 21000 instead of? Thanks