Do abandoned cart features work with all Shopify themes?

As a Shopify store owner, I've been wrestling with cart abandonment for months. Our traffic looks great, but our conversion rates are frustratingly low. I've tried multiple apps promising to 'solve' abandoned cart issues, but every time I install something, I'm terrified it'll clash with my carefully designed theme. My current theme is a custom design I invested serious money in, and I can't risk breaking the user experience or making my store look amateurish. When I see recommendations for abandoned cart solutions, my first question is always: 'Will this actually work with MY specific theme?' I've heard horror stories from other merchants about apps that look completely out of place, create weird layout shifts, or simply don't integrate smoothly. My store's aesthetic is everything—it's part of our brand identity. I need a solution that's not just technically compatible, but one that feels native to my design, creates genuine urgency, and actually converts hesitant shoppers without looking like a cheap, spammy pop-up. I'm looking for something sophisticated, intelligent, and flexible enough to work seamlessly across different theme architectures.