Hey guys need some help with my logic below. So essentially, a company has B2C and B2B Accounts & Contacts. To avoid person accounts for B2C contacts, i have written a trigger below to automatically create an account with recordtype 'Aministrative'. The trigger works fine, but it creates an account for all types of contacts - I need to create an 'Aministrative' Account only for Contact recordtype 'Customer'. Any other type of contacts (B2B), must lookup its Account beloew save or should create a new Account first, if the Account does not exist. 

Also, the company does a yearly load of all 'Customer' contacts - is there any governance issues with mass triggers? there could potentially 10k+ Contacts in the data load that would require auto creation of Accounts.

trigger CustomerAccountCreation on Contact (after insert) {

  RecordType arec = [SELECT ID FROM RecordType WHERE sObjectType = 'Account' AND DeveloperName = 'Administrative'];

    Map<Id, Account> aMap = new Map<Id, Account>();

    for (Contact con : trigger.new){
        if(con.AccountID == null){
            Account acc = new Account();
                acc.name = con.FirstName + ' ' + con.LastName + ' ' + 'Administrative';
                acc.RecordTypeId = arec.Id;
            aMap.put(con.Id, acc);
        }
    }

    if (!aMap.isEmpty()) {
        insert aMap.values();

        List<Contact> cList = new List<Contact>();

        for (Id cId : aMap.keySet()) {
            Contact con = new Contact();
                con.Id = cId;
                con.AccountId = aMap.get(cId).Id;
            cList.add(con);
        }

        update cList;

    }

}