Centos 7 systemd service start up not able to read file on network drive

I've read a bunch of systemd dependencies related on the web but still couldn't come up with one that works. I'm not sure what the problem is. The job is supposed to start on on reboot. It depends on network, autofs, rpc, and I've added a RequiresMountsFor, but still no luck. The unit still couldn't find a file on the network drive. Any ideas appreciated.

$ systemd-analyze critical-chain hello.service
The time after the unit is active or started is printed after the "@" character.
The time the unit takes to start is printed after the "+" character.

hello.service @11.520s
└─autofs.service @11.429s +88ms
  └─network.target @11.425s
    └─network.service @10.751s +674ms
      └─NetworkManager.service @1.326s +123ms
        └─basic.target @1.274s
          └─sockets.target @1.274s
            └─rpcbind.socket @1.274s
              └─sysinit.target @1.273s
                └─systemd-update-utmp.service @1.269s +2ms
                  └─auditd.service @1.204s +62ms
                    └─systemd-tmpfiles-setup.service @1.120s +82ms
                      └─rhel-import-state.service @1.111s +8ms
                        └─local-fs.target @1.109s
                          └─home.mount @734ms +261ms
                            └─dev-mapper-centos\x2dhome.device @734ms

This is the unit file:

$ cat hello.service
[Unit]
Description=Hello Tester
Requires=network-online.target autofs.service
After=network-online.target autofs.service
RequiresMountsFor=/path/to/file

[Service]
ExecStart=/usr/bin/ls -l /path/to/file/on_nfs > /tmp/hello_tester.log

[Install]
WantedBy=multi-user.target

Here's the error. I guess I can't specify that cmd line with multiple args like that. But it is apparent that it can't see the file on the network when start up.

$ systemctl status hello.service
● hello.service - Hello Tester
   Loaded: loaded (/etc/systemd/system/hello.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Sat 2016-07-30 02:18:02 HKT; 2 days ago
  Process: 1760 ExecStart=/usr/bin/ls -l /path/to/file/on_nfs > /tmp/hello_tester.log (code=exited, status=2)
 Main PID: 1760 (code=exited, status=2)

Jul 30 02:17:56 localhost.localdomain systemd[1]: Started Hello Tester.
Jul 30 02:17:56 localhost.localdomain systemd[1]: Starting Hello Tester...
Jul 30 02:18:02 localhost.localdomain ls[1760]: /usr/bin/ls: cannot access /path/to/file/on_nfs: No such file or directory
Jul 30 02:18:02 localhost.localdomain ls[1760]: /usr/bin/ls: cannot access >: No such file or directory
Jul 30 02:18:02 localhost.localdomain ls[1760]: /usr/bin/ls: cannot access /tmp/hello_tester.log: No such file or directory
Jul 30 02:18:02 localhost.localdomain systemd[1]: hello.service: main process exited, code=exited, status=2/INVALIDARGUMENT
Jul 30 02:18:02 localhost.localdomain systemd[1]: Unit hello.service entered failed state.
Jul 30 02:18:02 localhost.localdomain systemd[1]: hello.service failed.