According to IRS Publication 974, it's perfectly acceptable to find out the information on the 2nd lowest cost silver plan in order to ensure that the calculations for any Premium Tax Credit is determined correctly. The following is from the Instructions for Form 8962, line 10 for when your SLCSP information is missing and you didn't receive any Premium Tax Credit (zeros in Column C of the 1095-A):
"No APTC was paid for your coverage. If no APTC was paid for your or your family member’s coverage, the SLCSP premium reported in Part III, lines 21 through 32, column B, of Form 1095-A may be wrong, left blank, or reported as -0-. To determine your applicable SLCSP premium for each month, see Pub. 974 or, if you enrolled through the federally facilitated Marketplace, go to HealthCare.gov/Tax-Tool/."
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