You are correct that you do not have to file form 3520-A next year since you are not the beneficiary of a foreign trust. For the description of the property, you can list something like "residential real estate in City, Province, Country" or really any description that works for you - the IRS won't be too particular about that part. I would make your best reasonable guess as to the value of the property as of the date of your mother's death. Any reasonable method to obtain that will work for the purposes of this form, which doesn't involve payment of tax or any requirement to prove that value at the time of the filing.
You will not need to file the form again in 2024 - it's a one-time report that you've inherited something of value from a foreign person.
The form can't be filed electronically. To address the concern about proof of filing, you can send via registered mail if you are sending it from within the US. I can't locate a physical address listed on the form for courier service, so your options for proof of delivery are somewhat limited if you are sending it from outside of the US.
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