VOA process and timing of usage

Does anyone know if it's possible to obtain the VOA and not enter China immediately, then enter another day? We have a unique situation in that Zhuhai has multiple ports of entry from Macau. If we can only get the VOA in Gongbei, we would prefer to not enter China there but travel through Macau and enter China through the other Zhuhai port (Hengqin) another day. Thank you.