Assalam o alaykum,
هذه الاستغاثات في ظاهرها حرام، لأنها استعانة بغير الله تعالى، فالمدد بين الله وحده
Dr. Wahbah al-Zuhayli clearly mentions that istighathah from the creation is haram although tawassul is permissible. He mentions that we visit the graves as an admonishment and a lesson and not to seek their help.
He also defends Hafiz ibn Taymiyyah and Shaykh ibn 'Abd al-Wahhab from the accusation of tajsim. He says,
"It is impossible to ascribe anthropomorphism to ibn Taymiyyah (may Allah have mercy on him) since he is not actually of that opinion. Accusing him of that is due to having a negative assumption and misunderstanding. The is no reason to stir up differences arising from partisanship, and we must maintain proper adab with all of the 'ulama. Likewise, Muhammad ibn 'Abd al-Wahhab (may Allah have mercy on him) did not believe in anthropomorphism."