my @rows;
for my $provider( qw/Provider1 Provider2 Provider3/ ) {
   push @rows, $provider->search( 
        query=>..., sort=>..., 
        page=>1, rows=>10 
    );
}
# now I may end up with 30 rows for page 1
# but the client grid expects 10, so let's cut it down...
@rows = @rows [ 0..9  ];