What is the sex? Is it a wild caught animal or captive bred? This makes a big difference. I have never kept them personally, but I have oustaleti, which are very similar. But my advice would be do not cage it. Free range is the best method by far. Bigger chams really stress out when they do not have a large teritory to roam and protect. Also, even though they are considered "dessert" chams,they require ALOT of water. The bigger the cham is, they more water it needs. My melleri and oustaleti drink more that any chams i have ever seen. So my advice is lots of space, lots of water (I take my chams out of their free ranges and place them into a shower or sink and mist them for about 20 minutes a day, they really seem to enjoy it.) Though they need lots of water, do not soak the enclosure as this can result in bacterial infections (Such as in Melleri, when they develop soars on their feet. I do not know if this applies to spiny chams, but this is just a coutionary note. Again, this is just my opion, from my experience. Good look, I hoped this helps.
Anthony