I understand. Regulating temps in a sterlite tub is a constant struggle. That's one thing you can look forward to when you upgrade. Regulating temps in a pvc or plywood enclosure is much easier.
I wouldn't trust those suction cups to hold the probe in place, but I see you also have the probe wire duct taped in place and the probe wire's sandwiched between the side and the lid. So, that should be secure enough.
I wouldn't prioritize fake foliage either. Your snake doesn't care. The only difference is appearance and your enclosure isn't set up for visual appeal anyway.