Silicone molds for making a tray/stand, with a higher rim

Pour an epoxy resin decorative base/tray/serving tray for candles, fruit, candy, jewelry, etc. The base has a higher edge. The silicone mold may need support or a mold when pouring!

External dimensions of the form:
Square: 24.5 x 24.5 x 1.5 cm
Rectangle: 26.5 x 19 x 1.5 cm
Narrow rectangle: 37.5 x 11.5 x 1.3 cm