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As called out in the docs:
To ensure that your load balancer can scale properly, verify that each Availability Zone subnet for your load balancer has a CIDR block with at least a /27 bitmask (for example, 10.0.0.0/27) and at least 8 free IP addresses. Your load balancer uses these IP addresses to establish connections with the targets.
For the 2nd part of the question you can use the approach listed in this blog post Using static IP addresses for Application Load Balancers
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