What is the best floral foam for artificial flowers?

Could you elaborate on the ideal type of floral foam to use for artificial flowers? I'm seeking a foam that's both durable and able to securely anchor the artificial flowers in place. Are there specific brands or types of foam that are better suited for this purpose? Additionally, are there any tips or tricks you could share to ensure the flowers remain sturdy and in place, regardless of the type of foam used? It's important for me to find a foam that will work well with both my existing artificial flowers and any future additions to my floral arrangements. Thank you for your assistance in this matter.