Forum:Trap monsters and XYZ monsters

Trap Monsters: (...)All these cards are treated as both Monster Cards and Trap Cards while they are Summoned to the field, and as such, take up both a Monster Card Zone and a Spell & Trap Card Zone at the same time.(...)

If I use 2 "Zoma the Spirit" for summon "Number 39: Utopia", still i can't use my 2 "Spell/Trap Card Zone"? If "Utopia" deatach 1 "Zoma" or die, can I use "S/T Card Zones" used for summon "Zoma"? It's very important questions for me.