Nagios Core Configuration Expert for a Distributed deployment

We are looking for an expert in Nagios core configuration. In our deployment, we currently have one central Nagios XI server setup for alerting & notifications to the NOC team and multiple Nagios core servers that forward downstate of events to the central Nagios XI server for alerting & notifications. We need some assistance in setting up the configuration files on the Nagios core servers for Windows & Linux systems for agentless monitoring. For windows server, we have to use WMI for monitoring the OS parameters like disk, CPU, memory, network, services, processes, folders, files and overall system reachability. We also need to monitor SQL and active directory servers. For Linux, we can either use SSH or SNMP. We also have to use SNMP to monitor routers, switches and firewalls. You will be working in our R&D/Dev environment. We currently have a Nagios XI and a Nagios core deployed in this environment. Our Nagios core is successfully forwarding all notifications to Nagios XI using NRDP. We also have check_wmi_plus installed on the Nagios core server but we don't know who to configure this. Basically, the heavy lifting of installing the product is done. You just need to configure well-documented templates for us based on our requirements so that our team can use these templates to configure production systems. Further information will be provided to the successful bidder.