I have had good luck with the Zeal tape on plastic ESC trays. I just make sure that both the ESC and tray are cleaned with alcohol. Only 3 times in the last several years has the Zeal tape come off unintentionally, and I have taken some pretty big hits. Only once did it full separate so the ESC was flopping around. I have seen other tape fail too, so I don't think my record is to unreasonable.
But a secondary zip tie back up is not a bad idea.