Advice on starter “oven”’s?

Hi! Does anyone have any experience using products like these to get more power out of their starter? https://bakboden.se/produkt/sourdough-home-broed-taylor/

I struggle with getting my rye-based starter to really perform, even though I’ve had it for years. It makes a decent loaf but I find myself adding small amount of industrial yeast as backup. I bake more or less all year round, and winter time the apartment heating is on so I have cosy spots for it which improves it a little but not a lot. I also feed it with organic whole grain rye flour. Usually feed once every 24h. Haven’t tried upping the feed frequency though. But I wonder if its a temperature thing.

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Thankful for any advice and calling out a bullshit product if that is the case :D